3. A 30-kg box is sitting on an inclined surface as shown. The coefficient of static friction between the box and the surface is = 0.6. Force T is applied at an angle of a = 60°. Determine the force I needed for motion. Ov 05m

3. A 30-kg box is sitting on an inclined surface as shown. The coefficient of static friction between the box and the surface is = 0.6. Force T is applied at an angle of a = 60°. Determine the force I needed for motion. Ov 05m

Name: 3. A 30-kg box is sitting on an inclined surface as shown. The coeffi
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Description: 3. A 30-kg box is sitting on an inclined surface as shown. The coefficient of static friction between the box andthe surface is = 0.6. Force T is applied at an angle of a = 60°. Determine the force I needed for motion.Ov05m

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter5: The Laws Of Motion

Section: Chapter Questions

Problem 5.8P: (a) A cat with a mass of 850 kg in moving to the right with a constant speed of 1.44 m/s. What is...

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(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee? (b) During strenuous exercise it is possible to exert forces to the joints that are easily ten times greater than the weight being supported. What is the maximum force of friction under such conditions? The frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. Increased frictional forces can cause further damage and pain.
A physics major is cooking breakfast when he notices that the frictional force between his steel spatula and his Teflon frying pan is only 0.200 N. Knowing the coefficient of kinetic friction between the two materials, he quickly calculates the normal force. What is it?
(a) A cat with a mass of 850 kg in moving to the right with a constant speed of 1.44 m/s. What is the total force on the cat ? (b) What is the total force on the cat if it is moving to the left?
8. A block is at rest on a rough inclined plane and is connected to an object with the same mass as shown. The rope may be considered massless; and the pulley may be considered frictionless. The coeffi- cient of static friction between the block and the plane is us; and the coefficient of kinetic friction is k 0 A. g D. g - Hk sin(0) m a. What is the magnitude of the static frictional force acting on the block? B.m g [1 - sin(0)] C. mg D. mg cos(0) B. g - Hk cos(0) A. m g sin(0) E. mg [1 - cos(0)] b. If the rope were cut between the block and the pulley, what would be the magnitude of the acceleration of the block down the plane? C. g [sin(0) - μ cos(0)] sin(0)] c. If the mass of the suspended object is doubled, what will be the acceleration of the block up the plane? B. g [2 tan(0) - uk sin(0)] D. 2g [μ sin(0) - cos(0)] m E. g [tan (0) A. g [2 - μk sin(0)] C. g [2 cos(0) - μ sin(0)] E. g [2 sin(0) Hk Cos (0)]. -
17. A force F is used to hold a block of mass m = 4.62 kg on an incline as shown in the diagram. The plane makes an angle of 0 = 26.9° with the horizontal and F is perpendicular to the incline. The coefficient of static friction between the plane and the block is 0.206. What is the minimum force, F, necessary to keep the block at rest? F a. 59.1 N b. 118 N c. 45.3 N d. 19.6 N e. 88.6 N
A 50.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300 and the coefficient of kinetic friction is 0.200. A. What is the friction force on the box if a horizontal 140-N push is applied to it? If it moves, what is its acceleration? B. What is the friction force on the box if a horizontal 175-N push is applied to it? If it moves, what is its acceleration?
1. A 15.0 kg box is being pulled along level ground by a 75.0 N force that is directed at an angle of 20o above the horizontal. The coefficient of kinetic friction is 0.330. What is the acceleration of the box? 2. A 5.00 kg box is being pulled at constant speed up a 30o incline by a force of 45.0 N parallel to the incline. Determine the coefficient of kinetic friction between the box and the plane
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1. A 20-kg equipment is initially at rest on an inclined surface with a 15° angle with the horizontal. A force 75N sets the crate in motion. After moving, a 60N force is required to keep it moving with a constant speed. What are the static and kinetic coefficients of friction between the crate and the surface?
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